/* =====================================================================
   不檬英语 · 站点样式
   视觉参考：Claude 官网 —— 暖白纸感底色、衬线大标题、陶土橙强调、
             1px 细边框、极轻阴影、大量留白、编辑式排版
   ===================================================================== */

:root {
  /* 纸张与墨色 */
  --paper:    #faf9f5;
  --paper-2:  #f0eee6;
  --paper-3:  #e8e5da;
  --card:     #ffffff;
  --ink:      #141413;
  --ink-2:    #3d3b36;
  --ink-3:    #6b6860;
  --ink-4:    #96938b;
  --line:     #e8e4da;
  --line-2:   #d9d4c7;

  /* 品牌强调：浅蓝系
     accent        用于文字 / 图标 / 描边（白底对比 ≈ 4.6:1，满足 AA）
     accent-ink    用于浅蓝底上的文字（对比 > 9:1）
     accent-wash   浅蓝底色块
  */
  --accent:      #427394;
  --accent-2:    #6ea0c4;
  --accent-ink:  #1e3a4f;
  --accent-wash: #bfd8ea;
  --accent-wash-hover: #a9cbe3;
  --accent-soft: #eaf3f9;
  --accent-line: #c2d9e8;
  --accent-hover: #35617f;
  --forest:      #2f4f3f;
  --forest-soft: #eaf0ea;

  /* 语义色（低饱和，统一到纸感） */
  --ok:      #3f6b4f;
  --ok-bg:   #edf3ed;
  --warn:    #96631c;
  --warn-bg: #fbf2e2;
  --danger:  #a33a2c;
  --danger-bg: #fbece8;
  --info:    #3c5a6b;
  --info-bg: #eef2f4;

  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius:    12px;
  --radius-lg: 18px;

  --shadow-xs: 0 1px 1px rgba(20, 20, 19, .03);
  --shadow-sm: 0 1px 3px rgba(20, 20, 19, .05);
  --shadow:    0 12px 32px -18px rgba(20, 20, 19, .25);
  --shadow-lg: 0 30px 70px -40px rgba(20, 20, 19, .35);

  --nav-h: 68px;
  --max-w: 1200px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: "Tiempos Text", Georgia, "Times New Roman", "Songti SC",
                "Noto Serif SC", "SimSun", serif;
  --font-mono: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1;
}

a { color: var(--ink); text-decoration: none; transition: color .15s; }
a:hover { color: var(--accent); }

img { max-width: 100%; display: block; }
hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }

/* 标题：衬线 + 紧字距，编辑感 */
h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.14;
  letter-spacing: -.018em;
  color: var(--ink);
}
h1 { font-size: clamp(36px, 5vw, 62px); letter-spacing: -.028em; }
h2 { font-size: clamp(26px, 3vw, 38px); }
h3 { font-size: 20px; line-height: 1.3; letter-spacing: -.012em; }
h4 { font-size: 16px; font-family: var(--font); font-weight: 650; letter-spacing: 0; }
p { margin: 0; }

.wrap { width: 100%; max-width: var(--max-w); margin: 0 auto; padding: 0 28px; }
.muted { color: var(--ink-3); }
.small { font-size: 13.5px; }
.tiny { font-size: 12px; }
.center { text-align: center; }
.nowrap { white-space: nowrap; }
.mt-1 { margin-top: 8px; } .mt-2 { margin-top: 14px; } .mt-3 { margin-top: 22px; }
.mt-4 { margin-top: 34px; } .mt-5 { margin-top: 52px; }
.mb-2 { margin-bottom: 14px; } .mb-3 { margin-bottom: 22px; } .mb-4 { margin-bottom: 34px; }
.flex { display: flex; } .between { justify-content: space-between; } .center-x { align-items: center; }
.gap-1 { gap: 8px; } .gap-2 { gap: 14px; } .gap-3 { gap: 24px; }
.grow { flex: 1; }
.serif { font-family: var(--font-serif); }

/* 英文小标签：大写 + 字距，Claude 式 eyebrow */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-4);
}

/* ------------------------------------------------------------------ 导航 */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 249, 245, .88);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  height: var(--nav-h);
  max-width: var(--max-w); margin: 0 auto; padding: 0 28px;
  display: flex; align-items: center; gap: 32px;
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-serif); font-size: 19px; font-weight: 600; letter-spacing: -.02em; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand-mark {
  width: 30px; height: 30px; border-radius: 8px; flex: 0 0 auto;
  background: var(--ink); color: var(--paper);
  display: grid; place-items: center;
}
.brand-mark svg { width: 17px; height: 17px; }
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-link {
  padding: 7px 12px; border-radius: var(--radius-sm);
  font-size: 14px; color: var(--ink-2); transition: .15s;
}
.nav-link:hover { background: var(--paper-2); color: var(--ink); }
.nav-link.active { color: var(--ink); background: var(--paper-2); font-weight: 550; }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.nav-burger { display: none; }

/* ------------------------------------------------------------------ 会员胶囊 */
.member-chip {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 5px 11px; border-radius: 999px;
  border: 1px solid var(--line-2); background: transparent;
  font-size: 12.5px; color: var(--ink-2); white-space: nowrap;
}
.member-chip .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ink-4); }
.member-chip.is-trial { border-color: var(--accent-line); background: var(--accent-soft); color: var(--accent-ink); }
.member-chip.is-trial .dot { background: var(--accent); }
.member-chip.is-paid { border-color: #c6d6c9; background: var(--ok-bg); color: var(--ok); }
.member-chip.is-paid .dot { background: var(--ok); }
.member-chip.is-expired { border-color: #e7c3bb; background: var(--danger-bg); color: var(--danger); }
.member-chip.is-expired .dot { background: var(--danger); }

/* ------------------------------------------------------------------ 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius-sm); border: 1px solid transparent;
  font-family: inherit; font-size: 14px; font-weight: 550; line-height: 1.3;
  cursor: pointer; transition: .16s; white-space: nowrap;
  background: var(--paper-2); color: var(--ink);
}
.btn:hover { background: var(--paper-3); color: var(--ink); }
.btn:active { transform: translateY(.5px); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-primary:hover { background: #2b2a27; color: var(--paper); border-color: #2b2a27; }
.btn-accent { background: var(--accent-wash); color: var(--accent-ink); border-color: var(--accent-wash); }
.btn-accent:hover { background: var(--accent-wash-hover); color: var(--accent-ink); border-color: var(--accent-wash-hover); }
.btn-accent:active { background: var(--accent-2); color: #fff; border-color: var(--accent-2); }
.btn-ghost { background: transparent; border-color: var(--line-2); color: var(--ink-2); }
.btn-ghost:hover { background: #fff; border-color: var(--ink-3); color: var(--ink); }
.btn-white { background: #fff; border-color: var(--line-2); color: var(--ink); }
.btn-white:hover { border-color: var(--ink-3); }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: var(--radius-xs); }
.btn-lg { padding: 13px 24px; font-size: 15px; border-radius: 10px; }
.btn-block { width: 100%; }
.btn-danger { background: var(--danger-bg); color: var(--danger); border-color: #e7c3bb; }
.btn-disabled {
  background: var(--paper-2); color: var(--ink-4); border-color: var(--line);
  cursor: not-allowed; pointer-events: none;
}

/* ------------------------------------------------------------------ 卡片 */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow-xs);
}
.card-hover { transition: .18s; }
.card-hover:hover { border-color: var(--line-2); box-shadow: var(--shadow); }
.card-pad-sm { padding: 16px; }
.card-title { font-size: 15.5px; font-weight: 600; display: flex; align-items: center; gap: 8px; font-family: var(--font); }

/* 分割线式列表（Claude 常用） */
.divide-list > * { border-bottom: 1px solid var(--line); padding: 18px 0; }
.divide-list > *:last-child { border-bottom: 0; }

/* ------------------------------------------------------------------ 标签 */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 2px 8px; border-radius: var(--radius-xs);
  font-size: 11.5px; font-weight: 550; letter-spacing: .01em;
  background: var(--paper-2); color: var(--ink-2); border: 1px solid transparent;
}
.badge-accent { background: var(--accent-soft); color: var(--accent-ink); border-color: var(--accent-line); }
.badge-green { background: var(--ok-bg); color: var(--ok); }
.badge-warn { background: var(--warn-bg); color: var(--warn); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--info-bg); color: var(--info); }
.badge-dark { background: var(--ink); color: var(--paper); }
.badge-outline { background: transparent; border-color: var(--line-2); color: var(--ink-3); }

/* ------------------------------------------------------------------ 试用倒计时条 */
.trial-bar {
  background: var(--accent-soft);
  border-bottom: 1px solid var(--accent-line);
  color: var(--accent-ink); font-size: 13px;
}
.trial-bar .wrap { display: flex; align-items: center; gap: 10px; padding-top: 8px; padding-bottom: 8px; flex-wrap: wrap; }
.trial-bar .tb-icon { width: 18px; height: 18px; flex: 0 0 auto; color: var(--accent); display: grid; place-items: center; }
.trial-bar strong { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-weight: 600; letter-spacing: -.01em; }
.trial-bar .tb-action { margin-left: auto; }
.trial-bar.is-critical { background: var(--danger-bg); border-color: #e7c3bb; color: var(--danger); }
.trial-bar.is-critical .tb-icon { color: var(--danger); }

/* ------------------------------------------------------------------ Hero */
.hero { padding: 88px 0 72px; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.06fr .94fr; gap: 72px; align-items: center; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-3); margin-bottom: 26px;
}
.hero-eyebrow .pulse { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.hero h1 { margin-bottom: 22px; }
.hero h1 em { font-style: italic; color: var(--accent); }
.hero-sub {
  font-size: 17px; color: var(--ink-2); max-width: 500px; margin-bottom: 32px; line-height: 1.65;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.hero-note { margin-top: 22px; font-size: 12.5px; color: var(--ink-4); display: flex; gap: 18px; flex-wrap: wrap; }
.hero-note span { display: inline-flex; align-items: center; gap: 6px; }
.hero-note svg { width: 14px; height: 14px; }

/* 右侧：学习进度卡（纸感、细线、无重阴影） */
.hero-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 28px; box-shadow: var(--shadow);
}
.hero-card-top { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 22px; }
.hero-card-top .t { font-size: 13px; color: var(--ink-3); font-family: var(--font-mono); letter-spacing: .06em; text-transform: uppercase; }
.hero-ring { position: relative; width: 148px; height: 148px; margin: 6px auto 18px; display: grid; place-items: center; }
.hero-ring svg { transform: rotate(-90deg); }
.hero-ring .ring-val { position: absolute; text-align: center; }
.hero-ring .ring-val b { display: block; font-family: var(--font-serif); font-size: 34px; font-weight: 500; line-height: 1; letter-spacing: -.03em; }
.hero-ring .ring-val span { font-size: 11px; color: var(--ink-4); letter-spacing: .04em; }
.hero-stat-row { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); margin-top: 22px; padding-top: 18px; }
.hero-stat { text-align: center; border-right: 1px solid var(--line); }
.hero-stat:last-child { border-right: 0; }
.hero-stat b { display: block; font-family: var(--font-serif); font-size: 20px; font-weight: 500; letter-spacing: -.02em; }
.hero-stat span { font-size: 11.5px; color: var(--ink-4); }
.hero-float {
  margin-top: 18px; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 16px; display: flex; align-items: center; gap: 10px;
  background: var(--paper); font-size: 12.5px; color: var(--ink-3);
}
.hero-float b { color: var(--ink); font-weight: 600; }

/* ------------------------------------------------------------------ 区块 */
.section { padding: 72px 0; }
.section + .section { border-top: 1px solid var(--line); }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 36px; }
.section-head p { color: var(--ink-3); margin-top: 10px; font-size: 14.5px; max-width: 560px; }
.section-eyebrow { margin-bottom: 14px; }

/* ------------------------------------------------------------------ 考试卡 */
.exam-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.exam-card {
  background: var(--card); padding: 26px 24px; display: flex; flex-direction: column; gap: 14px;
  transition: .18s; position: relative;
}
.exam-card:hover { background: #fdfcf9; }
.exam-card.is-coming { background: #fcfbf7; }
.exam-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.exam-name { font-family: var(--font-serif); font-size: 24px; font-weight: 500; letter-spacing: -.02em; line-height: 1.2; }
.exam-name small { font-family: var(--font-mono); font-size: 11px; color: var(--ink-4); margin-left: 8px; letter-spacing: .06em; text-transform: uppercase; }
.exam-desc { font-size: 13.5px; color: var(--ink-3); min-height: 44px; line-height: 1.6; }
.exam-meta { display: flex; gap: 18px; font-size: 12.5px; color: var(--ink-4); border-top: 1px solid var(--line); padding-top: 14px; margin-top: auto; }
.exam-meta b { color: var(--ink); font-weight: 600; font-family: var(--font-mono); }
.exam-foot { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.exam-dot { width: 8px; height: 8px; border-radius: 50%; flex: 0 0 auto; }

/* ------------------------------------------------------------------ 套餐 */
.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.plan-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 28px 26px;
  display: flex; flex-direction: column; position: relative; transition: .18s;
}
.plan-card:hover { border-color: var(--line-2); box-shadow: var(--shadow); }
.plan-card.is-recommended { border-color: var(--ink); }
.plan-ribbon {
  position: absolute; top: -10px; left: 26px;
  background: var(--ink); color: var(--paper);
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase;
  padding: 4px 10px; border-radius: 4px; white-space: nowrap;
}
.plan-card.is-recommended .plan-ribbon { background: var(--accent-wash); color: var(--accent-ink); }
.plan-name { font-family: var(--font-serif); font-size: 21px; font-weight: 500; letter-spacing: -.015em; }
.plan-sub { font-size: 13px; color: var(--ink-3); margin-top: 6px; min-height: 20px; }
.plan-price { display: flex; align-items: baseline; gap: 5px; margin: 22px 0 6px; }
.plan-price .cur { font-size: 16px; color: var(--ink-2); }
.plan-price .num { font-family: var(--font-serif); font-size: 46px; font-weight: 500; letter-spacing: -.04em; line-height: 1; }
.plan-price .unit { font-size: 13px; color: var(--ink-4); }
.plan-price-old { font-size: 12.5px; color: var(--ink-4); text-decoration: line-through; margin-left: 6px; }
.plan-perday { font-size: 12px; color: var(--ink-3); font-family: var(--font-mono); }
.plan-perday b { color: var(--accent); font-weight: 600; }
.plan-features { list-style: none; padding: 18px 0 0; margin: 22px 0 0; display: flex; flex-direction: column; gap: 11px; border-top: 1px solid var(--line); }
.plan-features li { display: flex; gap: 10px; font-size: 13.5px; color: var(--ink-2); align-items: flex-start; line-height: 1.5; }
.plan-features svg { width: 14px; height: 14px; flex: 0 0 auto; margin-top: 3px; color: var(--ink-4); }
.plan-card .btn { margin-top: auto; margin-top: 26px; }

/* 渠道切换 */
.channel-tabs { display: inline-flex; border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; background: var(--card); }
.channel-tab {
  padding: 8px 16px; font-size: 13px; color: var(--ink-3); cursor: pointer;
  border: 0; border-right: 1px solid var(--line); background: transparent;
  font-family: inherit; display: inline-flex; align-items: center; gap: 7px; transition: .14s;
}
.channel-tab:last-child { border-right: 0; }
.channel-tab:hover { color: var(--ink); background: var(--paper); }
.channel-tab.active { background: var(--ink); color: var(--paper); }
.channel-tab .ccy { font-family: var(--font-mono); font-size: 10px; opacity: .6; }
.channel-tab:disabled { opacity: .42; cursor: not-allowed; color: var(--ink-4); background: transparent; }
.channel-tab:disabled:hover { color: var(--ink-4); background: transparent; }
.channel-tab:disabled .ccy { letter-spacing: .02em; }

/* 对比表 */
.compare-wrap { border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); overflow-x: auto; }
.compare-table { width: 100%; border-collapse: collapse; min-width: 640px; }
.compare-table th, .compare-table td { padding: 15px 20px; text-align: center; border-bottom: 1px solid var(--line); font-size: 13.5px; }
.compare-table th { font-size: 11.5px; font-family: var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-4); font-weight: 500; }
.compare-table td:first-child, .compare-table th:first-child { text-align: left; color: var(--ink-2); }
.compare-table tr:last-child td { border-bottom: 0; }
.compare-table .col-best { background: #fdfbf6; }
.compare-table .best-tag { color: var(--accent); font-weight: 600; }
.compare-table .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ------------------------------------------------------------------ 资源 */
.filter-bar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  border-bottom: 1px solid var(--line); padding: 0 0 16px; margin-bottom: 8px;
}
.filter-bar select, .filter-bar input {
  font-family: inherit; font-size: 13px; padding: 7px 10px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-2); background: var(--card); color: var(--ink); outline: none;
}
.filter-bar select:focus, .filter-bar input:focus { border-color: var(--ink-3); }
.filter-bar .spacer { flex: 1; }

.res-list { display: flex; flex-direction: column; }
.res-row {
  display: flex; align-items: center; gap: 18px;
  padding: 18px 4px; border-bottom: 1px solid var(--line); transition: .14s;
}
.res-row:hover { background: #fdfcf9; }
.res-icon {
  width: 42px; height: 42px; border-radius: var(--radius-sm); flex: 0 0 auto;
  display: grid; place-items: center; font-family: var(--font-mono);
  font-size: 9.5px; letter-spacing: .04em; text-transform: uppercase;
  background: var(--paper-2); color: var(--ink-3); border: 1px solid var(--line);
}
.res-icon.pdf { background: #fbf0ed; color: #9c4430; border-color: #efd8d1; }
.res-icon.doc, .res-icon.docx { background: #eef2f6; color: #3c5a6b; border-color: #dbe4ea; }
.res-icon.zip { background: #fbf4e8; color: #8a6220; border-color: #ecdfc6; }
.res-main { flex: 1; min-width: 0; }
.res-title { font-size: 14.5px; font-weight: 550; color: var(--ink); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.res-meta { font-size: 12.5px; color: var(--ink-4); margin-top: 4px; display: flex; gap: 14px; flex-wrap: wrap; }
.res-action { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }

/* ------------------------------------------------------------------ 表单 */
.form-row { margin-bottom: 18px; }
.label { display: block; font-size: 13px; font-weight: 550; color: var(--ink-2); margin-bottom: 8px; }
.input, .select, .textarea {
  width: 100%; font-family: inherit; font-size: 14.5px; color: var(--ink);
  background: var(--card); border: 1px solid var(--line-2); border-radius: var(--radius-sm);
  padding: 11px 13px; outline: none; transition: .15s;
}
.input:focus, .select:focus, .textarea:focus { border-color: var(--ink-3); box-shadow: 0 0 0 3px rgba(20,20,19,.05); }
.input::placeholder { color: var(--ink-4); }
.input-group { display: flex; gap: 8px; }
.input-group .input { flex: 1; }
.textarea { min-height: 96px; resize: vertical; line-height: 1.6; }
.hint { font-size: 12px; color: var(--ink-4); margin-top: 7px; }
.error-text { font-size: 12.5px; color: var(--danger); margin-top: 7px; }

/* 分段切换（登录方式等） */
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.seg button {
  padding: 8px 16px; font-family: inherit; font-size: 13px; color: var(--ink-3);
  background: transparent; border: 0; border-right: 1px solid var(--line); cursor: pointer;
}
.seg button:last-child { border-right: 0; }
.seg button.active { background: var(--ink); color: var(--paper); }
.seg button.is-locked { opacity: .45; cursor: not-allowed; }
.seg button.is-locked.active { background: var(--ink-3); }

/* ------------------------------------------------------------------ 提示 */
.alert { padding: 13px 16px; border-radius: var(--radius-sm); font-size: 13.5px; display: flex; gap: 10px; align-items: flex-start; border: 1px solid transparent; }
.alert-info { background: var(--info-bg); color: var(--info); border-color: #dbe4ea; }
.alert-ok { background: var(--ok-bg); color: var(--ok); border-color: #d3e0d5; }
.alert-warn { background: var(--warn-bg); color: var(--warn); border-color: #ecdfc6; }
.alert-danger { background: var(--danger-bg); color: var(--danger); border-color: #e7c3bb; }

/* ------------------------------------------------------------------ 弹窗 */
.modal-mask {
  position: fixed; inset: 0; background: rgba(20, 20, 19, .42);
  z-index: 200; display: none; align-items: center; justify-content: center; padding: 20px;
}
.modal-mask.show { display: flex; }
.modal {
  background: var(--card); border-radius: var(--radius-lg); max-width: 440px; width: 100%;
  padding: 30px; box-shadow: var(--shadow-lg); position: relative;
  animation: pop .2s ease-out; border: 1px solid var(--line);
}
@keyframes pop { from { transform: translateY(10px); opacity: 0; } to { transform: none; opacity: 1; } }
.modal-close {
  position: absolute; top: 14px; right: 14px; width: 28px; height: 28px;
  border: 0; background: transparent; border-radius: var(--radius-xs); cursor: pointer;
  color: var(--ink-4); font-size: 18px; line-height: 1; display: grid; place-items: center;
}
.modal-close:hover { background: var(--paper-2); color: var(--ink); }
.modal h3 { font-size: 24px; margin-bottom: 10px; font-family: var(--font-serif); }
.modal p { font-size: 13.5px; color: var(--ink-3); line-height: 1.65; }
.modal .modal-icon {
  width: 44px; height: 44px; border-radius: var(--radius-sm); display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent); margin-bottom: 18px;
}
.modal .modal-icon.is-warn { background: var(--danger-bg); color: var(--danger); }
.modal-actions { display: flex; gap: 10px; margin-top: 26px; }
.modal-actions .btn { flex: 1; }

/* ------------------------------------------------------------------ 学习页 */
.study-shell { max-width: 720px; margin: 0 auto; padding: 40px 28px 90px; }
.study-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.progress-track { height: 3px; background: var(--paper-3); border-radius: 999px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--ink); border-radius: 999px; transition: width .3s; }

.word-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 52px 36px; text-align: center; min-height: 340px;
  display: flex; flex-direction: column; justify-content: center; box-shadow: var(--shadow-xs);
}
.word-card .word { font-family: var(--font-serif); font-size: clamp(34px, 6vw, 50px); font-weight: 500; letter-spacing: -.03em; line-height: 1.1; }
.word-card .phonetic { color: var(--ink-4); font-size: 14px; margin-top: 10px; font-family: var(--font-mono); }
.word-card .pos { display: inline-block; margin-top: 14px; font-size: 11px; color: var(--ink-3); border: 1px solid var(--line); padding: 2px 8px; border-radius: 4px; font-family: var(--font-mono); }
.word-card .def { font-size: 19px; margin-top: 22px; color: var(--ink); line-height: 1.5; }
.word-card .example { margin-top: 20px; font-size: 14px; color: var(--ink-3); max-width: 500px; margin-left: auto; margin-right: auto; line-height: 1.7; }
.word-card .example b { color: var(--ink-2); font-weight: 550; }
.speak-btn {
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--line-2);
  background: var(--card); display: grid; place-items: center; cursor: pointer;
  color: var(--ink-2); transition: .16s; margin: 22px auto 0;
}
.speak-btn:hover { border-color: var(--ink-3); background: var(--paper); }
.speak-btn svg { width: 17px; height: 17px; }

.quiz-options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 26px; }
.quiz-opt {
  padding: 15px 18px; border-radius: var(--radius-sm); border: 1px solid var(--line-2);
  background: var(--card); font-family: inherit; font-size: 14.5px; color: var(--ink);
  cursor: pointer; text-align: left; transition: .14s;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--ink-3); background: var(--paper); }
.quiz-opt.correct { background: var(--ok-bg); border-color: #9dbc9f; color: var(--ok); }
.quiz-opt.wrong { background: var(--danger-bg); border-color: #d9a99f; color: var(--danger); }
.study-actions { display: flex; gap: 10px; margin-top: 22px; }
.study-actions .btn { flex: 1; }

/* ------------------------------------------------------------------ 收银台 */
.pay-shell { max-width: 520px; margin: 56px auto 90px; padding: 0 28px; }
.pay-amount { text-align: center; margin-bottom: 28px; }
.pay-amount .num { font-family: var(--font-serif); font-size: 46px; letter-spacing: -.04em; line-height: 1.1; }
.qr-box { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; text-align: center; }
.qr-box img { width: 240px; height: 240px; margin: 0 auto; border-radius: var(--radius-sm); }
.address-box {
  background: var(--paper); border: 1px dashed var(--line-2); border-radius: var(--radius-sm);
  padding: 12px 14px; font-family: var(--font-mono); font-size: 12.5px;
  word-break: break-all; display: flex; align-items: center; gap: 10px; text-align: left;
}
.address-box code { flex: 1; }

/* ------------------------------------------------------------------ 表格 */
.table-wrap { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; min-width: 660px; }
.table th, .table td { padding: 13px 18px; text-align: left; border-bottom: 1px solid var(--line); font-size: 13.5px; vertical-align: middle; }
.table th { background: transparent; font-family: var(--font-mono); font-weight: 500; font-size: 10.5px; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-4); border-bottom: 1px solid var(--line-2); }
.table tr:last-child td { border-bottom: 0; }
.table tbody tr:hover { background: #fdfcf9; }
.table .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ------------------------------------------------------------------ 页脚 */
.footer { border-top: 1px solid var(--line); padding: 56px 0 36px; margin-top: 56px; }
.footer-grid { display: grid; grid-template-columns: 1.8fr 1fr 1fr 1fr; gap: 36px; }
.footer h4 { font-size: 11px; font-family: var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-4); font-weight: 500; margin-bottom: 14px; }
.footer a { display: block; font-size: 13px; color: var(--ink-2); padding: 5px 0; }
.footer a:hover { color: var(--accent); }
.footer-bottom { margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--line); font-size: 12px; color: var(--ink-4); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ------------------------------------------------------------------ 空状态 */
.empty { text-align: center; padding: 64px 20px; color: var(--ink-4); }
.empty-icon { width: 48px; height: 48px; border-radius: var(--radius); border: 1px solid var(--line); display: grid; place-items: center; margin: 0 auto 18px; color: var(--ink-4); }

/* ------------------------------------------------------------------ 分页 */
.pager { display: flex; gap: 6px; justify-content: center; margin-top: 30px; }
.pager a, .pager span {
  min-width: 34px; height: 34px; display: grid; place-items: center;
  border-radius: var(--radius-xs); border: 1px solid var(--line); background: var(--card);
  font-size: 12.5px; color: var(--ink-2); padding: 0 9px; font-family: var(--font-mono);
}
.pager .active { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ------------------------------------------------------------------ 响应式 */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero { padding: 56px 0 48px; }
  .hero-card { max-width: 460px; }
  .plan-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .wrap, .nav-inner { padding-left: 18px; padding-right: 18px; }
  .nav { position: relative; }
  .nav-links { display: none; }
  .nav-burger {
    display: grid; place-items: center; width: 36px; height: 36px; border-radius: var(--radius-sm);
    border: 1px solid var(--line-2); background: transparent; cursor: pointer; color: var(--ink-2);
  }
  .nav.mobile-open .nav-links {
    display: flex; position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: var(--card); border-bottom: 1px solid var(--line); padding: 12px 18px;
    flex-direction: column; align-items: stretch; gap: 2px;
  }
  .section { padding: 48px 0; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .exam-grid { grid-template-columns: 1fr; }
  .res-row { flex-wrap: wrap; gap: 12px; }
  .res-action { width: 100%; justify-content: flex-end; }
  .quiz-options { grid-template-columns: 1fr; }
  .word-card { padding: 40px 22px; }
  .modal { padding: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .trial-bar .tb-action { margin-left: 0; }
  .hero-stat b { font-size: 18px; }
}

/* 注册页两栏 */
.auth-grid { display: grid; grid-template-columns: 1fr 460px; gap: 72px; align-items: start; }
@media (max-width: 960px) {
  .auth-grid { grid-template-columns: 1fr; gap: 32px; }
  .auth-grid > div:last-child { max-width: 460px; width: 100%; }
}

/* 无障碍 */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ------------------------------------------------------------------ 滚动淡入 */
/* 默认完全可见；只有 JS 成功接管（html.js-reveal）后才隐藏待入场元素 */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity .62s cubic-bezier(.22, .68, .28, 1),
    transform .62s cubic-bezier(.22, .68, .28, 1);
  will-change: opacity, transform;
}
.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* 减少动效：直接显示，不做位移 */
@media (prefers-reduced-motion: reduce) {
  .js-reveal [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}